Endoskeleton

Definition

An endoskeleton is an internal support structure of an organism, typically made of bone or cartilage. It provides structural support and protection for internal organs and allows for greater flexibility and movement than exoskeletons.

5 Must Know Facts For Your Next Test

1. Endoskeletons are characteristic of all vertebrates, including humans, birds, reptiles, amphibians, and fish.
2. The primary components of an endoskeleton are bones and cartilage, which grow as the organism grows.
3. Unlike exoskeletons, endoskeletons can be repaired by the organism if damaged.
4. Endoskeletons allow for attachment sites for muscles, facilitating complex movements and locomotion.
5. In some invertebrates like echinoderms (e.g., starfish), endoskeletal elements made of calcium carbonate provide support.

Review Questions

• What are the main components of an endoskeleton?
• How does an endoskeleton differ from an exoskeleton in terms of growth and repair?
• Which group of invertebrates possesses endoskeletal elements?

Related terms

Exoskeleton: A rigid external covering that supports and protects the body of some invertebrates.

Cartilage:

A flexible connective tissue found in various forms in the larynx and respiratory tract, among other places.

Bone:

A rigid organ that constitutes part of the vertebrate skeleton; it supports and protects various organs of the body.